The normal amount in disaster preparedness is 1gal per person per day. The problem with the larger amounts is that people see they need huge amounts and don't d

The normal amount in disaster preparedness is 1gal per person per day. The problem with the larger amounts is that people see they need huge amounts and don't do anything. Better to get started storing 5-7 gal for each person. The way to allow for extras is to store water for a longer length of time. If recommended value is two weeks, and it is in my area, then a month is a good buffer.